Universal suspension for electric vibrator



A ril 28, 1970 A. PFEUFFER 3,509,391

UNIVERSAL SUSPENSION FO R ELECTRIC VIBRATOR Filed Oct. 1, 1968 INVENTOR 4A/7v/v PFEUFFA-Z ATTORNEYS United States Patent 3,509,391 UNIVERSAL SUSPENSION FOR ELECTRIC VIBRATOR Anton Pfeufier, 301 E. 78th St., New York, N.Y. 10021 Filed Oct. 1, 1968, Ser. No. 764,096

Int. Cl. H02k 5/24 US. Cl. 31017 6 Claims ABSTRACT OF THE DISCLOSURE A suspension and mounting for a small electric vibrator in which the diaphragm carrying the magnet assembly is relieved of a substantial portion of its supporting function by provision of a second connection between the vibrator cover and a mounting bracket enabling the vibrator to be mounted in any position without subjecting the diaphragm to possibly destructive stresses.

BACKGROUND OF THE INVENTION In a known type of electric vibrator, useful with material sifting vibratory screens of the type shown, for instance, in applicants copending application Ser. No. 707,512 filed Feb. 23, 1968, a single mounting lug is attached to the center of a diaphragm which carries the magnet assembly and also is connected peripherally to the cover on which the armature is fixed. Vibration of the armature with respect to the magnet causes flexion of the diaphragm as the vibratory impulses are communicated to the mounting lug. As long as the vibration is in a vertical direction the stresses on the diaphragm are symmetrically distributed and do not tend to be destructive, but when the vibrator is inclined at any angle away from the vertical a lateral moment of inertial stress is introduced which may cause the diaphragm to fail peripherally or at other points.

It is the principal object of the present invention to provide a suspension and mounting system in which the diaphragm carries only the magnet assembly, the cover and armature being separately but cooperatively supported in such a manner that the vibrator can be mounted in any position without subjecting the diaphragm to undesirable forces.

The electric vibrator suspension and mounting system disclosed herein comprises a U-frame one leg of which is fixed to the center of the diaphragm while the other leg slidably supports the armature end of the cover, a guide member being mounted on the cover peripherally of the diaphragm and the U-frame having an extension attachable to a device, such as a screen, to be vibrated.

A practical embodiment of the invention is shown in the accompanying drawings, wherein:

FIG. 1 represents an elevation of a material sifting apparatus with which the vibrator may suitably be used;

FIG. 2 represents a vertical section through the vibrator and sifting screen as used in the apparatus of FIG. 1;

FIG. 3 represents a vertical section on the line III III of FIG. 2, and

FIG. 4 represents an exploded perspective view of the several parts.

Referring to the drawings, the apparatus shown in FIG. 1 is designed to add dry pulverized material from the hopper H through a metering device M to a mixing chamber C connected into a pipeline P, where the dry material is added to a flowing liquid, for instance, as explained in the copending application cited above. It is desirable to interpose between the metering device and the mixing chamber a screen of a selected mesh size which is connected to a vibrator to cause the material to flow at an even rate,-the screen 1 herein being supported by resilient (e.g., rubber) legs 2 from an annular collar 3 resting peripherally on the bottom of the metering device M and secured thereto.

The vibrator 4 is of a known type, designed for operation by conection to an AC. power line of suitable voltage, such connection being indicated at 5. The vibrator comprises a cup-shaped cover 6, a diaphragm 7 secured marginally to the rim of the cover, as by the screws 8. A magnet assembly including the core 9 and winding 10 is mounted centrally on the diaphragm by means of a rear center bolt 11 which also connects the diaphragm firmly to the angular rear leg 12 of a two-part U-frame. The angular front leg 13 of the U-frame is provided with a bushing 14 constituting a bear-ing adapted to receive slidably the cylindrical head 15 of the front center bolt 16. The bolt 16 passes through the center of the cover 6 and carries the cylindrical armature 17 on its inner end, the shank of the bolt being provided with a lock nut 18 for fixing the axial positions of the bolt and armature.

The upper arm of the angular front leg 13 is extended (horizontally, as shown in FIG. 2) to include a portion 19 designed to be fixed to the screen 1, by which the vibrator assembly is supported. The upper run of the angular rear leg 12 is attached fiatwise to the corresponding portion of the leg 13, as by screws 20, the legs being so spaced that the head 15 of the bolt 16 rests in bushing 14. Axial rotation of the vibrator assembly is prevented by the provision of a guide 21 having an arcuate part resting against the upper portion of the face of the diaphragm and upwardly projecting ears 22 spaced to accommodate the upper runs of the legs as shown in FIG. 3.

In operation, supplying an alternating current of suitable voltage to winding 10 will cause axial vibration of the magnet assembly 9, 10 and attached central portion of diaphragm 7, with respect to cover 6, the armature 17 and bolt 16 on which it is mounted, constituting a mass adapted for vibration reciprocally to the magnet assembly. The vibrations are in an axial direction, causing substantially symmetrical deformation of the diaphragm, entirely independent of gravity, by reason of the support of the assembly at both ends of its axis, i.e., bolt 11 in the center of the diaphragm and bolt 16 with head 15 slidable in bearing 14. The diaphragm is subjected to no lateral bending stresses in any position of the apparatus.

What I claim is:

1. A mounting bracket for an electric vibrator having a diaphragm and a mass adapted for vibration in a direction normal to the plane of said diaphragm, comprising a first bracket leg fixed to a point in said diaphragm, a second bracket leg spaced from said first leg, and hearing means between said mass and said second leg adapted to support at least a substantial proportion of the weight of said mass when the direction of vibration is other than vertical and to permit relative movement of said mass and said leg in the direction of vibration.

2. A mounting bracket according to claim 1 in which the bracket is substantially U-shaped, the diaphragm is substantially circular, the first leg is fixed to the center of the diaphragm, the mass is cylindrical and coaxial with the diaphragm, and the bearing means includes a bushing and a cylindrical body slidable in said bushing.

3. A mounting bracket according to claim 1 which includes a bracket extension adapted for connection of the vibrator to an element to be vibrated.

4. A mounting'bracket according to claim 3 in which the vlbrator is wholly supported by said extension.

5. A mounting bracket according to claim 1 in which each bracket leg is a right-angled strip, the first leg having one end attached to the center of the diaphragm, the second leg having the bearing means associated with one end, and parts of said legs spaced from said one ends being secured together.

A 6. A mounting bracket according to claim 5 in which the legs are secured together adjacent one side of the vibrator and which includes means guiding the vibrator for axial movement relative to the legs and preventing rotation of the vibrator around its axis.

References Cited UNITED STATES PATENTS 2,694,156 11/1954 Cerminara 31029 X 2,790,097 4/1957 Hopkins 31029 2,918,590 12/1959 Gilbert 310-29 3,159,108 12/1964 M'ullings 31091 X MILTON O. HIRSHFIELD, Primary Examiner D. F. DUGGAN, Assistant Examiner US. Cl. X.R. 

